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Mercury(II) Complexes of Anionic N-Heterocyclic Carbene Ligands: Steric Effects of the Backbone Substituent.

ABSTRACT: Mercury(II) complexes (Me-maloNHCDipp)HgCl (1b), (t-Bu-maloNHCDipp)HgCl (2b) and (t-Bu-maloNHCDipp)HgMe (2c) supported by anionic N-heterocyclic carbenes have been obtained in good yields from the reaction of the potassium salt of N-heterocyclic carbene ligand precursors and mercury(II) salts, HgCl2 and MeHgI. These molecules have been characterized by 1H-NMR, 13C-NMR and IR spectroscopy and elemental analysis. X-ray crystal structures of 1b and 2b are also presented. Interestingly, complex 1b is polymeric {(Me-maloNHCDipp)HgCl}n in the solid state, as a result of inter-molecular Hg-O contacts, and features rare three coordinate mercury sites with a T-shaped arrangement, whereas the (t-Bu-maloNHCDipp)HgCl (2b) is monomeric and has a linear, two-coordinate mercury center. The formation of T-shaped structure and the aggregation of complex 1b is attributable to the reduced steric demand of the N-heterocyclic carbene ligand backbone substituent.

SUBMITTER: Dash C 

PROVIDER: S-EPMC7464600 | biostudies-literature | 2020 Aug

REPOSITORIES: biostudies-literature

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Mercury(II) Complexes of Anionic <i>N</i>-Heterocyclic Carbene Ligands: Steric Effects of the Backbone Substituent.

Dash Chandrakanta C   Das Animesh A   Dias H V Rasika HVR  

Molecules (Basel, Switzerland) 20200816 16

Mercury(II) complexes (Me-maloNHC<sub>Dipp</sub>)HgCl (<b>1b</b>), (<i>t</i>-Bu-maloNHC<sub>Dipp</sub>)HgCl (<b>2b</b>) and (<i>t</i>-Bu-maloNHC<sub>Dipp</sub>)HgMe (<b>2c</b>) supported by anionic <i>N</i>-heterocyclic carbenes have been obtained in good yields from the reaction of the potassium salt of <i>N</i>-heterocyclic carbene ligand precursors and mercury(II) salts, HgCl<sub>2</sub> and MeHgI. These molecules have been characterized by <sup>1</sup>H-NMR, <sup>13</sup>C-NMR and IR spectro  ...[more]

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